After experimenting with many various Audioquest silver and copper speaker cables - silver will render significantly more detail for sure. And that detail increase will be weighted more in favor of higher frequencies. But it won’t be strident, harsh, or splashy. And it doesn’t hurt bass nor body, unless you use too small a gauge - but that can be a real problem because of silver’s high cost. The cables that mix both pure silver and pure copper wires can have a lovely tonal balance. My preferences have always been either pure silver or a mix with mostly (> 50%) silver. The new prices on AQ silver cables are stratospheric. But good used deals on older silver models do come up (Wildwood, WEL Signature, Kilimanjaro, Everest, K2, Obsidian, KE-6). Sometimes REALLY good deals. Keep in mind a 6 ft pair of Everest has a POUND of high purity silver in it.
It’s a very similar deal with the AQ interconnects, copper vs. silver. Except there are no hybrids in their IC lines. The lower end silver interconnects (Cheetah, Niagara, Wind) do have less body and weight than the higher-end silver cables.
If your system is already bordering on too bright or edgy, adding silver will definitely not help. Copper can help keep it under control. BUT better would be to resolve the balance issue in your system and then add silver cables to get the most of it :)